Future of jemallocator about jemallocator HOT 10 CLOSED

Eventually the plan is to remove the jemalloc crate from the standard library in favor of "some crate on crates.io". I was planning on this crate becoming that "some crate" barring any other developments. In the meantime I don't think there's much to gain from active development in libstd itself, but improvements/benchmarks would be most welcome here!

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Eventually the plan is to remove the jemalloc crate from the standard library in favor of "some crate on crates.io". I was planning on this crate becoming that "some crate" barring any other developments.

Which steps would be required to make this change, and what could I do to speed it up?

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We'd need to stabilize rust-lang/rust#27389 for global allocators (already in FCP) and rust-lang/rust#32838 for defining an allocator (now in FCP). To help speed it up I will say the objection to continue to figure out the excess-related APIs on rust-lang/rust#32838 probably isn't helping the speed of stabilizing...

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Is compiling on stable Rust a requirement for using jemallocator instead of liballoc_jemalloc in rustc ?

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It's a requirement for switching the default allocator for binaries to alloc_system, but not for using jemallocator in rustc AFAIK.

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It's a requirement for switching the default allocator for binaries to alloc_system,

How come?

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It's not really reasonable to switch off of jemalloc providing people with the means to switch back.

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Makes sense. I thought there might just be a compiler flag for selecting the allocator, but the allocator API is a much better option.

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Update: (for future readers, since people who commented so far are already aware :))

#[global_allocator] is now stable. rust-lang/rust#36963 tracks the removal of liballoc_jemalloc, which might be blocked on switching rustc to jemallocator: rust-lang/rust#51038

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Now making progress in: rust-lang/rust#55238

EDIT: progress was made!

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